Fix re-build (#24)

* Fix re-build

* Update test_ext.py

* rename JSON

sphinxext/rediraffe.py

@@ -1,3 +1,4 @@
+import json
 from os import rename
 import re
 import subprocess
@@ -36,7 +37,7 @@
 
 """
 )
-
+REDIRECT_JSON_NAME = "_rediraffe_redirected.json"
 RE_OBJ = re.compile(r"(?:(\"|')(.*?)\1|(\S+))\s+(?:(\"|')(.*?)\4|(\S+))")
 
 READTHEDOCS_BUILDERS = ["readthedocs", "readthedocsdirhtml"]
@@ -124,10 +125,11 @@ def build_redirects(app: Sphinx, exception: Union[Exception, None]) -> None:
     """
     Build amd write redirects
     """
-    try:
-        app.env.redirected
-    except AttributeError:
-        app.env.redirected = {}
+    redirect_json_file = Path(app.outdir) / REDIRECT_JSON_NAME
+    if redirect_json_file.exists():
+        redirect_record = json.loads(redirect_json_file.read_text("utf8"))
+    else:
+        redirect_record = {}
 
     if exception != None:
         return
@@ -224,11 +226,11 @@ def build_redirects(app: Sphinx, exception: Union[Exception, None]) -> None:
 
         if (
             build_redirect_from.exists()
-            and src_redirect_from.as_posix() in app.env.redirected
+            and src_redirect_from.as_posix() in redirect_record
         ):
             # if it is still pointing to the same source, continue
             if (
-                app.env.redirected[src_redirect_from.as_posix()]
+                redirect_record[src_redirect_from.as_posix()]
                 == src_redirect_to.as_posix()
             ):
                 continue
@@ -267,9 +269,9 @@ def build_redirects(app: Sphinx, exception: Union[Exception, None]) -> None:
             logger.info(
                 f'{green("(good)")} {redirect_from} {green("-->")} {redirect_to}'
             )
-            app.env.redirected[
-                src_redirect_from.as_posix()
-            ] = src_redirect_to.as_posix()
+            redirect_record[src_redirect_from.as_posix()] = src_redirect_to.as_posix()
+
+    redirect_json_file.write_text(json.dumps(redirect_record), encoding="utf8")
 
 
 class CheckRedirectsDiffBuilder(Builder):

tests/test_ext.py

@@ -29,13 +29,16 @@ def test_simple(self, app: Sphinx, ensure_redirect):
         ensure_redirect("another.html", "index.html")
 
     @pytest.mark.sphinx("html", testroot="simple")
-    def test_simple_rebuild(self, app: Sphinx, ensure_redirect):
+    def test_simple_rebuild(self, app_params, make_app, ensure_redirect):
+        args, kwargs = app_params
+        app = make_app(*args, **kwargs)
         if Path(app.outdir).exists():
             shutil.rmtree(Path(app.outdir))
         app.build()
         assert app.statuscode == 0
-        app.build()
-        assert app.statuscode == 0
+        app2 = make_app(*args, **kwargs)
+        app2.build()
+        assert app2.statuscode == 0
         ensure_redirect("another.html", "index.html")
 
     @pytest.mark.sphinx("html", testroot="no_cycle")
@@ -272,13 +275,16 @@ def test_simple(self, app: Sphinx, ensure_redirect):
         ensure_redirect("another/index.html", "index.html")
 
     @pytest.mark.sphinx("dirhtml", testroot="simple", freshenv=False)
-    def test_simple_rebuild(self, app: Sphinx, ensure_redirect):
+    def test_simple_rebuild(self, app_params, make_app, ensure_redirect):
+        args, kwargs = app_params
+        app = make_app(*args, **kwargs)
         if Path(app.outdir).exists():
             shutil.rmtree(Path(app.outdir))
         app.build()
         assert app.statuscode == 0
-        app.build()
-        assert app.statuscode == 0
+        app2 = make_app(*args, **kwargs)
+        app2.build()
+        assert app2.statuscode == 0
         ensure_redirect("another/index.html", "index.html")
 
     @pytest.mark.sphinx("dirhtml", testroot="no_cycle")